The teacher criticized him because he did not keep his remarks to the topic ______ discussion.

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问题 The teacher criticized him because he did not keep his remarks to the topic ______ discussion.

选项 A、on
B、at
C、with
D、under

答案D

解析 固定用法题。keep sth.under discussion是固定搭配,意为“使……处于讨论范围之内”。
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